Reproducing device



Patented Nov. 1l, 193) UNIT D STATES EDWARD e. sninranor WASHINGTON, DISTRICT or COLUMBIA REPRODUCING DEVICE Application' i'led 'October 4, 1929. Serial No. 397,346.

This invention relates to improvements in reproducers, and more particularly relates to the provision of an improved type of cone n diaphragm and mounting for suchpurposes.

5 One of the objects of the present invention is to provide a cone diaphragm which has a free edge, and which is supported at points removed from such edge.

Another object of this invention is tokpro-` 1e vide a support or mounting for theV cone which permits free vibration of the cone.

A further object of the invention is to provide a cone mounting which permits an ad: justment of the position of the cone to accommodate it to the driving unit of the re producer.

With these `and other objects in view as j will appear in the course of the following specification and claims, a constructional so form of the invention is set forth on the accompanying drawing, in which:

Figure 1 is a transverse sectional view through a reproducer embodying the Vpresent invention.

213 Fig. 2 is a rear elevational view of the cone taken substantially on the section line 2 2 of Fig. 1.

According to this invention, a cone is provided which is mounted with its edge free,

sa by the provision of flexible and compressible supporting members in Contact with the cone at points removed from its free edge: it being preferred to employ a material of the nature of sponge rubberV for these supporting members.

lIn the drawing, a conventional reproducer case is shown as comprising the side, top

and end walls and having a front wall 11 provided with a mouth 12. The driving unit or electromagnetic portion of the reproducer 13 is illustrated as secured to the rear wall of the reproducer, opposite a passage 111 therethrough by which the conducting leads may be led to this electromagnetic unit.

"Within the casing and surrounding the aperture 12 a truncated mounting cone 15 is secured as by gluing. lNithin this truncated mounting cone is located the reproducing cone 16, proper, which is connected at its apex by a suitable binding sleeve and connection 17 with the link 18 which leads to the electromagnetic unit 13 in known manner. The reproducing cone (16 is secured in spaced relationship to the mounting cone 15 by means of a plurality of Vcushions 19 which are preferably formed of sponge rubber or similar flexible and compressible material which is not competent 4to transmit vibrations from the reproducing cone to the mounting cone. As shown in Fig. 1, these cushions are preferably provided with a slit which freely engages over the smaller edge of the truncated mounting cone 15, so that they may slide thereon, while engaging with frictional resistance on this mounting cone to oppose such relative movement of the cones: and on the other hand are secured by cementing to the reproducing cene 16. As shawn in 2, the cushions are preferably of relatively small dimension in the peripheral direction of the cone, so that they in no wise ytend to absorb or diminish the capacity for vibration of the reproducing cone, but atall times-afford ita free opportunity to vibrate in accordance with the sound waves as transmitted thereto by movements of the connecting link 18. This movement of the cushions 19 upon the mounting cone 15 permits accurate adjustment of the reproducing cone with respect to the electromagnetic unit 13,- to correct for any smallvariations kin position of this latter unit, s o that any stresses imposed uponthe reproducing cone 16 by the cushions willbe balanced and Awill not lead to any warping of the cone or distortion of the sound reproduction..

lt will particularly be noted kthat sound vibrations imparted to the air within the casing 10, from the rear surface of the reproducing cone 1G, are substantially prevented from issuing through the aperture 12, by the interposition of the mounting cone 15 yin their path. 1n other words, these sound vi brations are not heard by an auditor, and hence there is no interference between these waves and the direct sound reproduction from the outwardly directed surface of f the reproducing vcone 16, thus leading to a freedom from interference and a better and more faithful reproduction of the sound as represented by the {iuctuations ol" the electric current entering the electromagnetic unit 13. It is obvious that the invention is not limited solely to the forni of execution shown, out that it may be modified in many Weys Within the scope of the appended clainis.

What I claim as nen7 and ldesire te secure by Letters Patent is: Y

l. A reproducer comprising a cone and 1 10 ineens connected to the apex thereof toV produce vibrations'thereof, kand cushions 'to support said reproducing cone mounted in contact therewith at points removed :troni the tree edge of said cone.

2. A reproducer comprising a reproducing;l

cone and mezins connected to the apex thereof for vibrating the same, a truncated mounting cone surrounding kthe free edge of said reproducing cone, and cushions interposed be- 2e tween the mounting cone and the re@` roducing cone to support the latter, the said cushions being formed of a. materiel which enbstantially incapable of transmitting Vibrations.

3. A reproducer as in cleiin 2, in which 'the `cushions are attached to the reproducine.` cone at points removed from the free edge thereof.

4. A reproducer as in cleini 2, in which 3C the `cushions are of sponge 'rubber and ere xedly Vsecured to the reproducing eone'at points removed from the free edge thereof, and are provided With slits by which the individual cushions frictionally embrace the :smaller edge of the mounting cone.

5. Areprodueer comprising a reproducingcone `and a driving device therefor connected to the ap X thereof for vibrating the saine, und a plurality of sponge rubber cushions for o supporting the reprodmfing cone, said cushions permitting a relative movement of the cone with respect to its support While opposing e frietional resistance to such movement. J

6. A ieproducer comprising a casing having an aperture in one Wall thereof, aV truncated mounting cone secured to said casing e nd surrounding seid aperture, a. reproducing cone and means connected to the apex thereof o for vibrating the saine.v the free edge of seid repreducing Cone being located Within said mounting cone, so that the mountingcone substantially prevents the emission of sound waves produced by the rear surface of the 5i reproducing eonefand cushioning ineens eonnecting said cones to support the reproducing Y cone, said cushioning means substantialli preventing the transmission of vibrations oi the reproducing cone to the mounting cone. Cl In testimony whereof, I afliX niy sienature.

EDWARD G. SEIBLJRT. 

